@AdamMosheh Alex and DoubleAA, I don't have exact criteria. I just pick the one I like best. Upvotes can sway me. Note that even in general "Accepted" doesn't mean "the correct answer." It means "most useful to the asker."
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Isaac MosesMay 25 '12 at 21:21

Six are the ways Israel was rewarded for Avraham's service to the angels:

Because Avraham called for the angels to be brought water, G-d repaid by providing water in the Midbar, in the Yishuv (settlement) and in the Messianic Age (e.g. "Spring water will flow out of Jerusalem (Zech. 14:8));

Because Avraham offered the angels a chance to wash their feet, Israel was repaid in the Midbar, Yishuv and the Messianic Age, with "water" to cleanse our sins;

Because Avraham invited the angels to recline beneath a tree, G-d spread out a cloud for shelter in the Midbar, succahs in Israel, and a tabernacle in the Messianic Age;

Because Avraham fetched a morsel of bread, Israel was repaid with manah in the Midbar, crops in the Yishuv, and the promise of abundant grain in the Messianic Era;

Because Avraham ran to the cattle, Israel was repaid with meat in the Midbar, abundant livestck in the Yishuv, and each man will have a heifer and two sheep in the Messianic Era;

And because Avraham stood over the angels, G-d attended our needs in the Midbar,leading us with the pillar of fire, listened to our prayers in the Yishuv, and will give us the Messiah.

Six are the words in the verse גדלו לה' אתי which we say when we take out the Sefer Torah, which correspond to the six steps taken by the bearers of the Ark between each sacrificing of an ox and fatling in the bringing of the Ark to the city of David (Tosefos Megillah 32a s.v. גוללו)

Must may have been too strong of a word, but yeah, according to some. I'll try to find the source for it. It has something to do with 2K year cycles (2K pre- prophecy, 2K prophecy, 2K present) and the 6th millennium from creation being the equivalent to Friday, which is the 6th day of the week which leads into Shabbat, the ultimate day of rest. Must be some chasidisha thing.
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JJLLJun 16 '14 at 1:24